James noad



(No Model.)

J. NOAD. METHOD 0F AND MEANS'POR PRODUGING LEAD OXID. N0..570,`71Z. Patented Nov. 3, 1896.

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UNITED STATES PATENT `OFFICE.

JAMES NOAD, OF LONDON, ENGLAND.

METHOD OF AND MEANS FOR PRODUCING LEAD OXID.

SPECIFICATION forming part of Letters Patent No. 570,712, dated November 3, 1896.

Application tiled August 1l, 1896 Serial No. 602,401. (No model.) Patented in Belgium May 7, 1896, No. 121,232.

T0 all whom t may concern:

Be it known that I, JAMES NOAD, engineer, residing at East Ham, London, Essex, England, have invented certain new and useful Improved Methods of and Means for Producing Lead Oxid, (for which I have obtained Belgian Patent No. 121,232, dated May '7, 1896,) of which the following is a specification.

This invention relates to an improved process of and means for converting metallic lead into lead oXid, whereby, among other advantages, the desired product can be more speedily obtained than by any existing process, and in an impalpable floury condition, rendering it greatly superior to lead oxid as hitherto produced for such uses in the arts and manufactures to which it is ordinarily applied.

To this end the invention consists in effecting the production of the oXid by subjecting metallic lead in a molten condition in a closed lead-melting tank to the combined influences of water (as such) and air injectedl or fed ther-conto, while the mass of liquid metal and the surface thereof are kept in turbulent motion, with the object of causing a continu ous circulation of the molten particles and of any partly-oxidized metal particles ioating thereon, and bringing the same into the most intimate contact with the elements of the air and water at a temperature which will dissociate such elements and will facilitate the desired combination, such process being eective in causing the lead to be oxidized more expeditiously and more completely and less expensively than is eected by any existing process of making lead oxid.

The accompanying drawings represent an arrangement of apparatus which may be used with advantage in carrying out the improved process, but I do not restrict myself to the exact construction or arrangement' of the parts as illustrated.

Figure l represents an elevation, partly in section; and Fig. 2 represents a plan, partly in section.

A represents a lead-melting tank heated by a furnace b and connected by a hood c with a series of any required number of hoppers d, wherein thelead oXid produced in and carried over from the tank a deposits in a floury condition, a-s aforesaid.

' turbulent motion.

The tank is fitted with a revolving agitai tor e, formed with radial arms e, adapted to plough over the bottom of the tank, and with vanes or blades e2, adapted to deflect the peripheral portions of the molten lead toward the center, and with stirrers e3, adapted to agitate the mass of the molten metal and vto breakup and keep the surface thereof and any partly-oxidized metal Hoa-ting thereon in The agitator-shaft c4 projects through the hood c and is connected by gearing f with a driving-shaft g, which is su pported in brackets h and is fitted with a driving-pulley i, adapted to be driven by any convenient motive power, and with a pulleyj. The tank is also tted with an air-tube k, fitted with jets k', serving to direct jets of air ontov the surface of the molten lea-d, the air being supplied to the tube under pressure by ablower m, driven from the pulley j. The tank is also fitted with pipes n, serving to direct jets of water onto the surface of the molten lead, the water being supplied to the pipes n by a common main o from any convenient reservoir, or otherwise in any convenient manner under any required pressure.

The piping supplying the air and water is fitted with cocks p, or like means of regulating the respect-ive supply.

The end hopper d is connected to a condensing-chamber q of any required capacity, into which any lead oXid which may be carried by the current past the lioppers will deposit and in which any watery particles which may be carried over will also condense. The chamber q is covered by layers of fabric r, or may be otherwise provided with means adapted to relieve the internal pressure due to the operations effected within the tank a. and to the current carrying over the lead oxid, while preventing the escape of the latter, and is also fitted with a tap s for drawing olf any condensed water and formed with a doorwayt for removing the deposited oXid.

In carrying out the. invention, when the ICO turbulent surface .of the liquid metal and partly-oxidized metal Heating thereon, by which it is instantly dissociated into its elements and explosively -disperses the adja-v cent metal particles and strips off the oXid coating from any partly-oxidized metal particles, While the air is also simultaneously inl j ected onto such surface,wl1ere,consequently,

the molten lead particles and the partly-oxidized and oxid-stripped lead particles and the elements of the Water and air are brought Y Wil-l to produ-ce lead oxid of any color froma pale .straw-to a deep red, as may be required, .according vto the intended purpose of the product, by simply regulating the temperature of the lead-bath, increasing the temperature the darker the color is requiredm I claim as my inventionl. The process of producing lead oxid from metallic lead, consisting in subjecting lead, in a molten condition, in a closed lead-melting tank, to the combined infiuences of Water (as such) and of air injected or fed thereonto, While the mass .of the metal and the surface thereof are kept in turbulent motion, substantially as described.

2. The described means of producing lead oxid from metallic lead, the same consisting in a lead-melting "tank connected by a hood with a series of depositing-hoppers and a condenser, and `itted Withan agitatoradapt- A ed to keep the mass and :the surface of the molten lnie-tal in turbulent motion, and with means respectively serving :to direct jets 4of Water and of :air onto the 'molten metal., .substantially as described.

Signed at London, ilnglani,` this 29th day of July, 1896.

JAMES NOAD..

W'itnesses:

CHARLES AUBREY DAY, ARTHUR WILLIAM McRnToN. 

